90 lines
3.1 KiB
C++
90 lines
3.1 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <gen_cpp/olap_file.pb.h>
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#include <memory>
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#include <mutex>
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#include <unordered_map>
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#include "olap/tablet_schema.h"
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#include "util/doris_metrics.h"
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namespace doris {
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class TabletSchemaCache {
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public:
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static void create_global_schema_cache() {
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DCHECK(_s_instance == nullptr);
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static TabletSchemaCache instance;
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_s_instance = &instance;
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std::thread t(&TabletSchemaCache::_recycle, _s_instance);
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t.detach();
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}
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static TabletSchemaCache* instance() { return _s_instance; }
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TabletSchemaSPtr insert(const std::string& key) {
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DCHECK(_s_instance != nullptr);
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std::lock_guard guard(_mtx);
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auto iter = _cache.find(key);
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if (iter == _cache.end()) {
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TabletSchemaSPtr tablet_schema_ptr = std::make_shared<TabletSchema>();
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TabletSchemaPB pb;
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pb.ParseFromString(key);
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tablet_schema_ptr->init_from_pb(pb);
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_cache[key] = tablet_schema_ptr;
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DorisMetrics::instance()->tablet_schema_cache_count->increment(1);
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DorisMetrics::instance()->tablet_schema_cache_memory_bytes->increment(
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tablet_schema_ptr->mem_size());
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return tablet_schema_ptr;
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}
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return iter->second;
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}
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private:
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/**
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* @brief recycle when TabletSchemaSPtr use_count equals 1.
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*/
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void _recycle() {
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int64_t tablet_schema_cache_recycle_interval = 86400; // s, one day
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for (;;) {
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std::this_thread::sleep_for(std::chrono::seconds(tablet_schema_cache_recycle_interval));
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std::lock_guard guard(_mtx);
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LOG(INFO) << "Tablet Schema Cache Capacity " << _cache.size();
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for (auto iter = _cache.begin(), last = _cache.end(); iter != last;) {
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if (iter->second.unique()) {
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DorisMetrics::instance()->tablet_schema_cache_memory_bytes->increment(
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-iter->second->mem_size());
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DorisMetrics::instance()->tablet_schema_cache_count->increment(-1);
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iter = _cache.erase(iter);
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} else {
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++iter;
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}
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}
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}
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}
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private:
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static inline TabletSchemaCache* _s_instance = nullptr;
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std::mutex _mtx;
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std::unordered_map<std::string, TabletSchemaSPtr> _cache;
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};
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} // namespace doris
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